docs: def set_trace(host='', port=5555, patch_stdstreams=False):
      """
      Start the debugger
  
      This method suspends execution of the current script
      and starts a PDB debugging session. The web-interface is opened
      on the specified port (default: ``5555``).
  
      Example::
  
          import web_pdb;web_pdb.set_trace()
  
      Subsequent :func:`set_trace` calls can be used as hardcoded breakpoints.
  
      :param host: web-UI hostname or IP-address
      :type host: str
      :param port: web-UI port. If ``port=-1``, choose a random port value
       between 32768 and 65536.
      :type port: int
      :param patch_stdstreams: redirect all standard input and output
          streams to the web-UI.
      :type patch_stdstreams: bool
      """
      pdb = WebPdb.active_instance
      if pdb is None:
          pdb = WebPdb(host, port, patch_stdstreams)
      else:
          # If the debugger is still attached reset trace to a new location
          pdb.remove_trace()
      pdb.set_trace(sys._getframe().f_back)